The biggest issue I see with a CF barrel at that price is, you are getting close to Vudoo price if you drop the cash on one for a 455. Obviously someone looking for an auto loader (10/22) isn't going to go for a Vudoo but the money you'd have into a 455 putting a carbon fiber barrel on it would be pushing Vudoo price or getting close to it. I'm a huge CZ fan though, so I can totally see the desire for souping up a 455.
I don't have any 10/22 experience as far as aftermarket support goes. Without looking up pricing, I imagine it would put guys in a dilemma between the nearly half price Volquartsen CF barrel and the Proof. I would certainly fork out the extra money if the Proof was proven more accurate time and time again compared to the Volquartsen though. Not sure what the track record is in terms of accuracy for the Volquartsen CF barrels.